public static void Run()
        {
            string filePath    = Constants.SAMPLE_DOCX_2;
            string filePathOut = Path.Combine(Constants.GetOutputDirectoryPath(), Constants.SAMPLE_NAME + Path.GetExtension(filePath));

            using (Merger merger = new Merger(filePath))
            {
                merger.Join(Constants.SAMPLE_DOCX_3);
                merger.Join(Constants.SAMPLE_DOCX_4);
                merger.Save(filePathOut);
            }

            Console.WriteLine("Source documents was merged successfully.");
            Console.WriteLine($"Check output {filePathOut}.");
        }